[imp] Search results of more than 100 messages cause 'error communicating with the server'

[Tim ODriscoll]

Quoting Michael M Slusarz <slusarz at horde.org>:
> The only thing I can think of is that your cache storage backend is  
> not writable by the webserver.  You should make sure that cache  
> files are actually appearing in the directory you have configured to  
> store cache files in.

Thank you for the summary of the caching process. I've verified that  
the cache files are appearing for both the Horde Cache and Horde  
Sessions. I've put them into seperate sub directories off /tmp now  
(and changed their ownership to the same as the webserver) and files  
are appearing in there with the designated prefix. Each file ranges in  
size from 1 byte to 533Kb at the time of writing. I've tried changing  
the directory depth setting to no avail as well, so have put it back  
to 0.

So if I understand this correctly, IMP is caching the data correctly  
to disk but is not reading it back for some reason. Surely if apache  
can write the cache files in the first place, it should be able to  
read them back again? Indeed, if there was a caching problem it would  
manifest itself somewhere else as well?

Short of a complete server rebuild to wipe the slate clean, is there  
anything else I can try?

Many thanks,

Tim